All-optical filter for simultaneous implementation of microwave bandpass and notch responses based on semiconductor optical amplifier |
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Authors: | Enming XU Xinliang ZHANG Lina ZHOU Yu ZHANG Yuan YU Fei WANG Dexiu HUANG |
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Affiliation: | Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074,China |
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Abstract: | An all-optical filter structure to simultaneously implement microwave bandpass and notch filter is proposed and experimentally demonstrated. The structure is based on a recirculating delay line (RDL) loop consisting of a semiconductor optical amplifier (SOA) followed by a tunable narrowband optical filter and a 10:90 coupler. The converted signal is generated in a wavelength conversion process based on cross-gain modulation of amplified spontaneous emission in the SOA. The converted signal circulating in RDL loop realizes a negative bandpass response. The negative bandpass filter and a broadband allpass filter are synthesized to achieve a notch filter with flat passband which can excise interference with minimal impact on the wanted signal. |
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Keywords: | microwave photonic microwave filters opti-cal signal processing semiconductor optical amplifier cross-gain modulation amplified spontaneous emission |
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